One of the nice things about all this expansion is that investor groups are actually pushing and fighting for a franchise. That's a huge indication of the increased interest in the WNBA. Also with salaries set to rise in the very near future, it's becoming a much more lucrative market.
I hope the W continues to be a "destination" sport where interest continues to grow. I'd like to see the W tell Atlanta to get a new facility to play in, or risk losing the franchise. Not sure it's possible for the W to pressure them like that, but no excuse to play in a 3,500 seat arena. If Atlanta isn't interested in supporting their team, apparently plenty of other places for them to go.
Not sure where i'd like to see the next franchise go, but I don't think you can look to WNBA "history" for fan interest since the entire WNBA landscape has changes so much in the past few years...